Engine-lathe.



PATENTED NOV. 26, 1907.

J HARTNBSS. ENGINE LATHE.

APPLIUATION FILED D110. 19. 1905..

i `To, all whom it may concern: I

ying machinery, gine lathes in which work of small diameters f 1o is held in centers.

JAMES HARTNESS, OF SPRINGFIELD, VERMONT.

ENGINE-LATHE.

Specification of Letters Patent.y

Patented NOV. 26, 1907'.

.ippiimuon tied December i9. i905. seen No. 292.436.

Be it known that I, JAMES HAETNEss, of Springfield, in the county of I/Vindsor and State of Vermont, have invented certain new and useful Improvements in Engine-Lathes, of which 'the following is a specification.

y This invention has relation to metal workand more particularly to en- It has been my aim in de- Signing machines of this general character, to prevent the possibility of error m the work l and the ysupport by eliminating bridge constructions, or thosel in which a tool or cutter surmounts a pile of 7slides or supports. It is well recognized that for ideal results, the'periphery of the work i for the cutter should be in such proximity, and the support should be so located with res ect to the oint or edv-e of yielding of the lobject the intervention of cross slides.

the cutter, that there will be no springing or parts. The present invention therefore has for its to secure as nearly as possible a construction and arrangement of the tool slide and the cutter in which the cutter is adjustablyisupported solidly on a slide, that is, in turn supported solidly by the bed, without bridge construction or l further object of the invention is to provide a single tool slide of the character ref ferred to, with a plurality of cutters all Iaded uponand co-pending application,

justable towards and from each other, and ada tedto be thrown into and out of action as esired.

"Iny attaining these objects, I pro ose to employ amainslide or carriage whic is mountrigidly su ported upon a bed. Preferably the bed an carriage are of the construction illustrated and described in my Serial No. 269,477,

' filed July 13, l905,-that is, the carriage is supported upon a guide rail which extends along the front of the bed, the rail and carriage being `in close proximity to the line of `the lathe centers, so

that the lathe has a small or lowswing. `The carriage is adapted f for the rece tion of cutter holders which may rare bodilyadjustable towards be adjuste towards and from each other, and which may be rigidly clamped or otherwise directly and rigidly secured to the carriage so as to become, for all practical purposes, a component or integral part thereof. These cutter holders are constructed to receive and directly support the cutters, which and from the l work, independently of each other, by suitable means, but the holders in which they are mounted are immovable except towards and from each other.

Referring to the accompanying drawings,` Figure 1 represents in transverse vertical scction an engine lathe embodying my invention.

Fig. 2 represents in front elevation a portion of the same. Fig. 3 represents a plan View,

on a smaller scale, of a portion of the lathe.

F ig. 4L represents a horizontal section through one of the cutters and its holder.

0n the drawings-I have `illustrated a portion of an engine lathe, in which the bed is indicated as a whole at a, the carriage at t, and the work centers at f The top of the bed is formed at 'the frontJ portion thereof, with a guide rail or way a which is substantially oblong in cross section, with its rear wall or face below, and ashort distance in front of, a line connecting the lathe centers. The under wall or face of the rail is formed by grooving the front face of the bed as shown at a2 in Fig. 1. i

The main carriage or tool slide l) consists of a casting which is relatively long, and which is angular in cross section so as to bear against the top of the rail -and against the front faces of the rail and bed. The slide has a rib b which extends downwardly in the rear of the rail. Between the rib b and therear face of the rail, and between the under faceof the rail and that part of the carriage which projects into the groove a2 are gibs of suitable form which permit the carriage to s lide along the motion between the contacting faces.

Any suitable mechanism may be utilized for effecting the travel of the carriage, and as the feeding mechanism forms no part of the present invention I shall not describe it in detail. In my co-pending application, hereinbefore referred to, I have illustrated and described in detail a form of feeding mechanism which may be employed. The top of the carriage is substantially flat and may be formed with a dovetail tongue b2, on which may be clamped a series of cutterholders c c c2 c3. It is immaterial, of course, so far as the broad features of the invention are concerned, what particular means are employed for securing the holders to the carriage, so long as the holders are iirmly supported and are held from yielding undery strains. In bases of the rail without lost as to be immovable towards or from the 2 v872,233 Y v j l Having thus explained the nature of the invention and described one form of its construction and one mode of its use without attempting to set forth all the forms in which it may be made or all the modes of its use, what l claim is:

1. ln an engine lathe, a bed, a carriage longitudinally slidable thereon, a plurality of independent cutter holders supported directly on said carriage and immovable towards and' from the work but adjustable towards and fromeach other, means for rigidly attaching said toolholders to said carriage after adjustment, a cutter slidably mounted in each of said holders, and means on each holder for positively moving the vcutter thereon towards and from the work.

2. ln an engine lathe, a bed, a carriage longitudinally slidable thereon, a cutter with dovetail grooves to receive the tongue j on the carriage, and there are clamping gibs d and screws d" by which each holder may be rigidly clamped or attached to the carriage, a 'ter it has been adjusted to proper position. The innery ends of the holders j rest solidly upon the top of the carriage, as shown in Fig. 1.

Each holder consists of an oblong block with an aperture extending therethrough from front to rear. ln the aperture in each holder is placed a cutter e and a screw e. The operative end of each cutter projects a short distance beyond the inner end of its holder, and from Fig. l it will be observed that the holders and the slide are so proportioned that the points or edges of t'he cutters are in proper position to be engaged with the work, which is there shown in dotted position. Thecutter itself is in each case adjustable with reference to its holder, and

each holder is so constructed, as described,

tudinally of its lines of travel but vsecured directly to said carriage so that it is immovholder having a socket transversely of its which is arranged lines of movement, means for rigidly secur- The abutting ends ing said holder to said carriage each holder j therewith, a cutter slidable in the socket in work axis. The adjustment of each cutter 'is effected by its screw e in alinement therewith. of `the cutter and screw in are formed with knobs or under cut heads, and yokes e2 or other detachable connections engaging said heads, serve to detachably connect the screw and cutter together. The projecting end of each screw will prefercatory carriage, a plurality of cutter holdersr ably be equipped with a handle cf of suitseated directly against said carriage but able construction to facilitate its rotation j adjustable towards and from each other, by the operator and enable him to adjust j means for rigidly securing said cutter hold? the cutter with accuracy toward and from 'j ers after adjustment to said carriage, an the work. uncla'mped cutter From the foregoing description it will be l seen that after the cutter holders have been adjusted to proper relative position, and have been secured rigidly in place, the carriage may be fed, to cause all (or as many as may be desired) of the cutters to operate simultaneously on the work, and that hence I the labor and time required to turn a piece of work may be reduced to a minimum.

said holder, and a screw on said holder con-l nected to said cutter to move it back and forth in its socket.

3. ln an engine in its holder towards and from the work.

ln testimony whereof l have affixed my signature, in presence of two witnesses.

JAMES HARTNESS. v

Witnesses:

F. B. GILL, W. D. WooLsoN.

holder adjustable on said carriage longi-` able towards and from the work, said cutter to travel lathe, a bed, a reciproi bar slidingly seated m U and directly supported by each of said holders and means for adjusting each cutter bar 

